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ppmtoxpm - convert a PPM iamge into an X11 pixmap
ppmtoxpm
[-name=xpmname] [-rgb=rgb-textfile] [-alphamask=pgmfile] [ppmfile]
Minimum
unique abbrevations are acceptable.
Reads a portable pixmap
as input. Produces X11 pixmap (version 3) as output which can be loaded
directly by the XPM library.
For example, to convert the file "dot" (found
in /usr/include/X11/bitmaps), from xbm to xpm one could specify
- xbmtopbm
dot | ppmtoxpm -name dot
or, with a rgb text file (in the local directory)
- xbmtopbm dot | ppmtoxpm -name dot -rgb rgb.txt
- -name=xpmname
- The -name
option allows you to specify the prefix string which is printed in the
resulting XPM output. If not specified, will default to the filename (without
extension) of the <ppmfile> argument. If you do not specify -name or ppmfile,
(i.e. your input is from Standad Input), the prefix string defaults to the
string noname.
- rgb=rgb-textfile
- The -rgb option allows you to specify an
X11 rgb text file for the lookup of color name mnemonics. This rgb text
file is typically the /usr/lib/X11/rgb.txt of the MIT X11 distribution,
but any file using the same format may be used. When specified and a RGB
value from the ppm input matches a RGB value from the <rgb-textfile>, then
the corresponding color name mnemonic is printed in the XPM's colormap.
If you don't specify -rgb or if the RGB values don't match, then ppmtoxpm
produces the color specifications in the #RGB, #RRGGBB, #RRRGGGBBB, or
#RRRRGGGGBBBB hexadecimal format.
- -alphamask=pgmfile
- This option names a
PGM file to use as an alpha (transparency) mask. The file must contain an
image the same dimensions as the input image. ppmtoxpm marks as transparent
any pixel whose position in the alpha mask image is at most half white.
If you don't specify -alphamask, ppmtoxpm makes all pixels in the output
opaque.
ppmcolormask is one way to generate an alpha mask file. You might
also generate it by extracting transparency information from an XPM file
with the -alphaout option to xpmtoppm. There are similar options on other
Netpbm converters that convert from formats that include transparency information
too.
An option to match the closest (rather than exact) color
name mnemonic from the rgb text would be a desirable enhancement.
Truncation
of the least significant bits of a RGB value may result in nonexact matches
when performing color name mnemonic lookups.
ppmcolormask(1)
, xpmtoppm(1)
,
ppm(5)
XPM Manual by Arnaud Le Hors lehors@mirsa.inria.fr
Copyright (C) 1990
by Mark W. Snitily.
Permission to use, copy, modify, and distribute this
software and its documentation for any purpose and without fee is hereby
granted, provided that the above copyright notice appear in all copies
and that both that copyright notice and this permission notice appear in
supporting documentation. This software is provided "as is" without express
or implied warranty.
This tool was developed for Schlumberger Technologies,
ATE Division, and with their permission is being made available to the
public with the above copyright notice and permission notice.
Upgraded
to XPM2 by Paul Breslaw, Mecasoft SA, Zurich, Switzerland (paul@mecazh.uu.ch)
Thu Nov 8 16:01:17 1990
Upgraded to XPM version 3 by Arnaud Le Hors (lehors@mirsa.inria.fr)
Tue Apr 9 1991
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